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If it is just for storage and not general purpose charging and battery rejuvenation, I use a CTEK US 0.8. Only O.8A, but is fine for maintaining battery charge and light enough to hang from a ceiling plug-in above the car. I leave my Caterham battery on this charger over the winter.
I also have a NOCO Genius 10 10A charger for more series charging and desulphasion duties, which is also safe to leave permanently on the battery, typically I will use this on the BMW if It doesn’t get driven for a week or more in the winter.
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